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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Automotive Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Automotive Engineers
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Nov 2006
Volume 14, Issue 5 - Sep 2006
Volume 14, Issue 4 - Jul 2006
Volume 14, Issue 3 - May 2006
Volume 14, Issue 2 - Mar 2006
Volume 14, Issue 1 - Jan 2006
Selecting the target year
Aluminum Space Frame B.I.W. Optimization Considering Multidisciplinary Design Constraints
Kim Bum-Jin ; Kim Min-Soo ; Heo Seung-Jin ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 1~7
This paper presents an ASF (Aluminum Space Frame) BIW optimal design, which minimizes the weight and satisfies multi-disciplinary constraints such as the static stiffness, vibration characteristics, low-speed crash, high-speed crash and occupant protection. As only one cycle CPU time for all the analyses is 12 hours, the ASF design having 11-design variable is a large scaled problem. In this study, ISCD-II and conservative least square fitting method is used for efficient RSM modeling. Then, ALM method is used to solve the approximate optimization problem. The approximate optimum is sequentially added to remodel the RSM. The proposed optimization method used only 20 analyses to solve the 11-design variable design problem. Also, the optimal design can reduce the]
of total weight while satisfying all of the multi-disciplinary design constraints.
Characteristics of Rh- Pd- Pt Three-Way Catalysts with Double-Layer Washcoat on the Hydrothermal Aging
Choi Byungchul ; Jeong Jongwoo ; Son Geonseog ; Jung Myunggun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 8~16
The research was conducted to characterize of Rh-Pd-Pt TWC with a double-layer washcoat for gasoline vehicle. The physical characteristics on surface of catalyst were inspected by BET, SEM and TEM. The characteristics of catalytic reaction were examined by the TPD/TPR and CO-pulse chemisorption. The catalyst
showed superior conversion performance after hydrothermal aging process, which was due to small difference of the surface area between. the fresh and the aged catalyst. The CO-chemisorption and surface area were superior in the 600 cpsi catalyst than other catalysts, this catalyst also shown the higher conversion efficiency of the exhaust emissions. From the TPR test, the conversion performance of the aged catalyst was decreased by the agglomeration and sintering of the PM and metal oxides. From the TPD result, it was found that the NO chemisorption was happed on the bottom-layer washcoat with Pd, and the NO chemisorption was re-happened on the upper-layer washcoat with Pt and Rh in the desorption process.
Effect of Injector-driven Type on Spray Behavior and Fuel Atomization Characteristics
Park, Ji-Hong ; Suh, Hyun-Kyu ; Park, Sung-Wook ; Kim, Jae-Wook ; Lee, Chang-Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 17~24
This study was performed to figure out spray behavior and fuel atomization characteristics of a piezo-driven injector and a solenoid-driven injector in the common-rail injection system under the same design parameters and test conditions. The process of spray injection was visualized by using the spray visualization system composed of a Nd:YAG laser and an ICCD camera. The atomization characteristics were investigated in terms of axial mean velocity, Sauter mean diameter(SMD) and droplet distributions obtained from a phase Doppler particle analyzer system. Compared with solenoid-driven injector, the piezo-driven injector has short injection delay and reaches quickly to the maximum injection value. Spray tip penetration shows some difference, however, spray angle of piezo-driven injector is wider than that of solenoid-driven injector. Sauter mean diameter of piezo-driven type injector is smaller than that of solenoid-driven type.
Kinematic Optimum Design of a Torsion-Beam Suspension Using Genetic Algorithms
Ok, Jin-Kyu ; Baek, Woon-Kyung ; Sohn, Jeong-Hyun ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 25~30
This study is about an optimum design to improve the kinematic and compliance characteristics of a torsion-beam suspension system. The kinematic and compliance characteristics of an initial design of the suspension was obtained through a roll-mode analysis. The objective function was set to minimize within design constraints. The coordinates of the connecting point between the torsion-beam and the trailing arm were treated as design parameters. Since the torsion-beam suspension has large nonlinear effects due to kinematic and elastic motion, Genetic Algorithms were employed for the optimal design. The optimized results were verified through a double-lane change simulation using the full vehicle model.
Engine Friction Reduction Through Liner Rotation
Joo Shinhyuk ; Kim Myungjin ; Matthews Ronald D. ; Chun Kwang-Min ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 31~38
Cylinder liner rotation is a new concept for reducing piston assembly friction in the internal combustion engine. The purpose of cylinder liner rotation is to reduce the occurrence of boundary and mixed lubrication friction in the piston assembly. This paper reports the results of experiments to quantify the potential of the rotating liner engine. A GM Quad-4 SI engine was converted to single cylinder operation and modified for cylinder liner rotation. The hot motoring method was used to compare the friction loss between the baseline engine and the rotating liner engine. Additionally, tear-down tests were used to measure the contribution of each engine component to the total friction torque. The cycle-averaged motoring torque of the RLE represents a
friction reduction compared to the baseline engine for hot motoring tests. Through tear down tests, it was found that the piston assembly friction of the baseline engine is reduced from
at 1200 rpm to
at 2000 rpm through liner rotation.
Effect of Shape of Discharge Port on Hydraulic Performance of Automotive Closed Type Water Pump
Heo, Hyung-Seok ; Lee, Gee-Soo ; Bae, Suk-Jung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 39~47
Recent trend in pursuit of high performance and effectiveness for automotive cooling system has changed the application of material for impeller of automotive water pump from metal to high ability engineering resin, which can achieve optimization of design of impeller geometry and realize lightweight high efficiency water pump. Closed type water pump improves hydraulic loss of fluid through the clearance between volute casing and impeller compared with that of the existing open type water pump(Although closed type is heavier than open type for the same size and same material, adoption of plastics can solve the problem.). In the present study, the characteristics of hydraulic performance of closed type water pump were investigated with respect to the angle between shroud and hub of impeller and the shape of discharge port of volute casing. Performance tests were carried out for 4 cases, that is, for 2 impellers and 2 casings. The modification of shape of only discharge port can enhance the hydraulic performance by 10 percent and the pump efficiency by 4-6 percent.
Fatigue Life Evaluation of Spot Weldments of SPC Sheet Including Strain Rate Effect
Song, Joon-Hyuk ; Nah, Seok-Chan ; Yu, Hyo-Sun ; Kang, Hee-Yong ; Yang, Sung-Mo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 48~53
A methodology is described for predicting the fatigue life of the resistance spot weldment including strain rate effect. Because it is difficult to perform a physical failure test with high strain rate, an analytical method is necessary to get the mechanical properties of various strain rate, To this end, quasi-static tensile-shear tests at several strain rate were performed on spot weldments of SPC. These test provided the empirical data with the strain rate. With these results, we formulated the function of fatigue life prediction using the lethargy coefficient which is the global material property from tensile test. And, we predicted the fatigue life of spot weldment at dynamic strain rate. To confirm this method for fatigue life prediction, analytical results were compared with the experimental fatigue data.
Load Characteristics and Sensitivity Analysis for an Automotive Clutch Diaphragm Spring
Lee, Byoung-Soo ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 54~59
An analytical solution for deflection-load characteristics of a conical disk spring used especially in the automotive manual transmission clutch applications is proposed in order to take into account the effects of friction and large deformation. The conical disk spring, or the diaphragm spring, has a hinge support, an application point of release load at the tip of the fingers and an application point of clamp load near but inside the outer perimeter of the conical disk spring. The friction coefficient is assumed to be a constant regardless of the speed of deflection and the magnitude of loads. Comparison with experimental shows a good agreement with the analytical prediction. Also, the sensitivity of the clamp load due to variations in the geometrical parameters of the conical disk spring is calculated and discussed.
Effect of the Power Steering System Driving Torque on Vehicle Fuel Economy in a Passenger Car
Kim Namkyun ; Han Changho ; Kim Wooseok ; Lee Jonghwa ; Park Jinil ; Park Kyungseok ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 60~67
To improve the vehicle fuel economy, various technologies have been studied. Meanwhile it deteriorates fuel economy that the increased driving torque for Power Steering System (PSS) due to weighted vehicle and widened tire for low speed driving and parking. So the larger driving torque for PSS is, the lower fuel economy is. Therefore, the study about the effect of the driving torque for PSS and the engine total friction must be preceded to improve the vehicle fuel economy. In this study, a PSS module separated from the vehicle is used to measure the driving torque for PSS with respect to the pressure of PSS. The result shows that the driving torque for PSS was in direct proportion to the pressure of PSS 3 (N-m) driving torque for PSS vs. 10 (bar) pressure of PSS, and 8 (N-m) vs. 40 (bar). In addition, the driving torque and pressure for PSS was measured according to the engine speed in the component test condition which was in the vehicle condition. Measuring the driving torque for PSP in the vehicle condition was established by using the VeFAS which was a fuel economy analyzer developed in our lab and installing PSS By-pass line. The effect of the driving torque for PSS on the vehicle fuel economy was analyzed with FTP-75 cold start mode.
Numerical Study on the Injector Shape and Location of Urea-SCR System of Heavy-duty Diesel Engine for Preventing
Jeong Soo-Jin ; Lee Sang Jin ; Kim Woo-Seung ; Lee Chun Beom ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 68~78
In the past few years, considerable efforts have been directed towards the further development of Urea-SCR(selective catalytic reduction) technique for diesel-driven vehicle. Although urea possesses considerable advantages over Ammonia
in terms of toxicity and handling, its necessary decomposition into Ammonia and carbon dioxide complicates the DeNOx process. Moreover, a mobile SCR system has only a short distance between engine exhaust and the catalyst entrance. Hence, this leads to not enough residence times of urea, and therefore evaporation and thermolysis cannot be completed at the catalyst entrance. This may cause high secondary emissions of Ammonia and isocyanic acid from the reducing agent and also leads to the fact that a considerable section of the catalyst may be misused for the purely thermal steps of water evaporation and thermolysis of urea. Hence the key factor to implementation of SCR technology on automobile is fast thermolysis, good mixing of Ammonia and gas, and reducing Ammonia slip. In this context, this study performs three-dimensional numerical simulation of urea injection of heavy-duty diesel engine under various injection pressure, injector locations and number of injector hole. This study employs Eulerian-Lagrangian approach to consider break-up, evaporation and heat and mass-transfer between droplet and exhaust gas with considering thermolysis and the turbulence dispersion effect of droplet. The SCR-monolith brick has been treated as porous medium. The effect of location and number of hole of urea injector on the uniformity of Ammonia concentration distribution and the amount of water at the entrance of SCR-monolith has been examined in detail under various injection pressures. The present results show useful guidelines for the optimum design of urea injector for reducing Ammonia slip and improving DeNOx performance.
The Penetration Characteristics of CFRP Laminated Shells on the Change of Stacking Sequences and Curvatures
Cho, Young-Jea ; Kim, Young-Nam ; Yang, In-Young ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 79~85
CFRP(Carbon Fiber Reinforced Plastics) of the advanced composite materials as structural materials for vehicle, has a wide application in light-weigh structural materials of airplanes, ships and automobiles because of high strength and stiffness, However, there is a design variable to be considered in practical application of the laminate composite materials, these materials are vulnerable to transverse impact. This paper is to study the effects of stacking sequence and curvature on the penetration characteristics of composite laminate shell. They are stacked to
and their interlaminar number two and four. They are manufactured to various curvature radius (R=100, 150, 200mm and
), When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determing the time for it to pass two ballistics-screen sensors located a known distance apart. The critical penetration energy of specimen A and B with less interfaces were a little higher than those of C and D. As the curvature increases, the critical penetration energy increases linearly because the resistance to the in-plane deformation as well as bending deformation increases, which need higher critical penetration energy. The specimen A and C have higher critical penetration energy than B and D because of different stacking sequences. We examined crack length through a penetration test. For the specimen A with 2interfaces, the longest circumferential direction crack length were observed on the first interface from the impact point. For the specimen B 4-interface, the longest circumferential direction crack length were observed on the second interface from the impact point.
FE Analysis on the Press Forging of AZ31 Magnesium Alloy
Hwang, Jong-Kwan ; Kang, Dae-Min ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 86~91
Magnesium alloys have been widely used for many structural components of automobiles and aircraft because of high specific strength and good castability in spite of hexgonal closed-packed crystal structure of pure magnesium. In this paper, FE analysis was executed about the formability of AZ3l magnesium alloy on press forging process. For this, the variation of sheet temperature, distribution of punch force and the effect of heat transfer and friction between punch and sheet on the forming characteristics during press forging of AZ31 has been analyzed by finite element analysis. In order to obtain temperature dependence of material characteristics, uniaxial tension tests at elevated temperature were done under temperature of
A Study on Measurement and Automation Method of Cylinder Head Swirl
Lee Choong-Hoon ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 92~99
The swirl ratio of a charge in the cylinder was estimated by calculating the ratio of the rotary speed of charge which could be simulated from the rotary speed of paddle in the swirl measurement apparatus, to the engine speed which could be calculated by measuring intake air flow rate. The automation of the swirl ratio measurement for cylinder head was achieved by controling both valve lift in cylinder head and a suction pressure of surge tank using two step-motors. The number of measurement position for calculating mean swirl ratio was varied by adjusting the interval of valve lift. The mean swirl ratio with varying the number of measurement position showed nearly constant value. Two measurement methods for measuring the swirl ratio were compared, one was to control the suction pressure of the surge tank with PID (proportional, integral, differential) mode with by-pass valve controlled by the step motor and the other did not control the surge tank pressure by fixing the by-pass valve. The difference of the mean swirl ratio between the two measurement methods showed nearly constant value with varying the number of measurement position. This means that the w/o PID control method could be preferred to the PID control method which has been used, due to the simpleness of the swirl measurement.
A Study on Behaviour and Characteristics of Spark Discharge in Spark Ignition System
Lee Myung Jun ; Hall Matt ; Ezekoye Ofodike A. ; Matthews Ron ; Chung Sung Sik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 100~108
Time-resolved current and voltage measurements for an inductive automotive spark system were made. Also presented are measurements of the total energy delivered to the spark gap. The measurements were made in air for a range of pressures from 1-18atm, at ambient temperatures. The measured voltage and current characteristics were found to be a function of many ignition parameters; some of these include: spark gap distance, internal resistance of the spark plug and high tension wire, and pressure. The voltages presented were measured either at the top of the spark plug or at the spark gap. The measurements were made at different time resolutions to more accurately resolve the voltage and current behavior throughout the discharge process. This was necessary because the breakdown event occurs on a time scale much shorter than the arc and glow phases. The breakdown, are, and glow voltages were found to be functions of spark plug resistance, gas density, and spark plug gap as expected from the literature. Spark duration was found to decrease as either pressure or gap was increased. The transition from the arc to glow phase is usually distinguished by a sudden rise in the voltage across the gap. At pressures above about 7atm this transition was not observed suggesting that a glow phase was not present. Energy delivered to the gap increased with increasing pressure. The effective resistance of the spark gap during discharge was about twice as large for the glow phase as the arc phase.
A Study on the Application Characteristics of Ultrasonically Irradiated Bio-Diesel Fuel in Common-mil Direct Injection Diesel Engine
Choi Dooseuk ; Jung Youngchul ; Im Seukyeon ; Ryu Jeongin ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 109~114
The reformed bio-diesel fuel irradiated by the ultrasonic wave is applied to the diesel engine of common rail in common use recently. This study has the object to examine the properties of engine performance and discharged materials. The bio-diesel fuel is mixed and used with the diesel fuel in common use at the ratio of
. The ultrasonic energy is irradiated to the individually mixed fuel in order to reform the fuel. This fuel is applied to the engine in this experiment. And It is compared and analyzed from the experimental results with two cases irradiating the ultrasonic wave and no irradiating.
Numerical Study on Strategy of Applying Low Pressure Loop EGR for a Heavy Duty Diesel Engine to Meet EURO-4 Regulation
Ha Changhyun ; Lee Seungjae ; Lee Kyoseung ; Chun Kwangmin ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 115~122
EGR system has been widely used to reduce NOx emission in light duty diesel engines, but its application to heavy duty diesel engine is not common yet. In this study, simulation model for EURO-3 engine was developed using commercial code WAVE and then verified by comparison with experimental results in performance and emission. Possibility to meet EURO-4 regulation using modified EURO-3 engine with LPL EGR system was studied. Each components of the engine was modeled using CATIA and WaveMesher. The engine test mode was ESC 13 and injection timing and quantity were changed to compensate engine performances, because applying EGR causes power reduction. As a results of the simulation, it was found that EURO-4 NOx regulation could be achieved by applying LPL EGR system to current EURO-3 engine even with some BSFC deterioration.
A Mathematical Model Development of Automotive Transmission Starter-Generator
Jang BongChoon ; Karnopp Dean C. ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 123~128
The proposed mathematical model of the starter-generator system incorporates the motor speed, battery voltage and the desired current to estimate the moment generation capabilities of the starter-generator and the actual current of the battery system. The fundamentals for this mathematical modeling are the simulated results of the experimental data. These pertinent data are used in establishing the governing equations for the determination of motor moments, actual battery currents and efficiencies of the system's operation at different loading characteristics and speed regions. The derived equations will be used into simulation programs to predict the fuel efficiency, vehicle characteristics of a hybrid electric vehicle equipped with a transmission starter-generator which will be developed.
An Experimental Study on the Measurement of Flow Field in a Direct Diesel Engine Using a Single Cylinder Visualization Engine
Han, Yong-Taek ; Hwang, Kyu-Min ; Lee, Ki-Hyung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 129~137
This paper studies the effects of the swirl for the variation of intake port configuration that is key parameters in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on air-fuel mixing, combustion, and emissions. To investigate the effects of the swirl flow, various rpm(250, 500, 750) and two different intake port were used. And to evaluate the swirl motion in the flow field visualization engine, steady state flow test was conducted. Helical port intake port and SCV(Swirl Control Valve) were selected as the design parameters to increase the swirl flow and parametric study was performed. In the case of non-SCV, intake flow rate and non-dimensional swirl ratio were higher than those of SCV for the swirl head type. So, we could strengthen the swirl in the flow field with the swirl head type and don't using SCV. From the results of steady state flow test, non-swirl head type has the most good advantage for intake flow rate, and also the flow rate could be increased by using the SCV slightly. The effects of the type of engine head on intake air flow capability are dominant with respect to the existence of the SCV. We could measure the qualitative grade of swirl by capturing the scattering signal of microballoon from ICCD camera in the visualization diesel engine.
Study of HSDI Diesel Engine Development for Low Fuel Consumption
Chun, Je-Rok ; Yu, Jun ; Yoon, Kum-Jung ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 138~143
Modification of injector, oil ring tension reduction and oil pump rotor re-matching with optimization of relevant engine control parameters could drive fuel consumption reduction of HSDI diesel engine. A 5 holes injector was replaced with a 6 holes with smaller nozzle hole diameter and 1.5 k factor, and evaluated in a view of fuel economy and emission trade-offs. With introducing smaller nozzle hole diameter injector, PM(Particulate Matter) was drastically decreased for low engine load and low engine rpm. Modification of oil pump and oil ring was to reduce mechanical friction and be proved to better fuel economy. Optimization of engine operating conditions was a great help for the low fuel consumption. Influence of the engine operating parameters· including pilot quantity, pilot interval, air mass and main injection timing on fuel economy, smoke and NOx has been evaluated with 14 points extracted from NEDC(New European Driving Cycle) cycle. The fuel consumption was proved to
improvement on an engine bench and
with a vehicle.
The Effects of Split-Injection and EGR on the Combustion Characteristics of a DISI Engine
Moon Seoksu ; Choi Jaejoon ; Abo-Serie Essam ; Bae Choongsik ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 144~152
Split injection has been known to reduce total hydrocarbon (THC) emission level and increase engine performance under certain operating conditions 1, 2). Exhaust Gas Recirculation (EGR) is a common technique adopted for nirtric oxides (NOx) reduction by the dilution of intake air, despite a sacrifice of simultaneous increase in THC and decrease in engine performance3). Thus, using split injection with adequate EGR may improve the emission level of UBHC, NOx and the engine performance compared to that of single-injection with or without EGR cases. The purpose of this study is to investigate the engine performance and emission levels at various engine operating conditions and injection methods when it is applied with EGR. The characteristics of single-injection and split-injection were investigated with various engine loads and EGR rates. The engine speed is changed from 800rpm to 1200rpm to investigate how the combustion characteristics are changing with increasing engine speed.
Development of the Optimization Analysis Technology for the Combustion System of a HSDI Diesel Engine
Lee Je-Hyung ; Lee Joon-Kyu ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 153~158
To optimize the combustion system in a HSDI diesel engine, a new analysis technology was developed. The in-cylinder 3-D combustion analysis was carried out by the modified KIVA-3V, and the spray characteristics for the high pressure injection system were analyzed by HYDSIM. The combustion design parameters were optimized by coupling the KIVA-3V and the iSIGHT. The optimization procedure consists of 3 steps. The
step is the sampling method by the Design of Experiment(DOE), the
step is the approximation using the Neural Network method, and the
step is the optimization using the Genetic Algorithm. The developed procedures have been approved as very effective and reliable, and the computational results agree well with the experimental data. The analysis results show that the optimized combustion system in a HSDI diesel engine is capable of reducing NOx and Soot emissions simultaneously keeping a same level of the fuel consumption(BSFC).
A Study on Durability Performance Estimation for Development of Chassis Corner Module
Choi Sungjin ; Park Jungwon ; Jeon Kwangki ; Yoo Youngmyun ; Choi Gyoojae ; Park Taewon ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 159~166
Chassis system has a large influence on ride quality, stability and NVH performance of a car. To improve the performance and reduce cost, the development of chassis modular assemblies is emphasized. To develop chassis corner modules, it is necessary to predict the performance of full vehicle motion such as ride, handling performance, NVH characteristics and durability of modules. In this paper, full vehicle test is performed to acquire the road load data of chassis corner module of passenger car. 3-axis simulator modeling are carried out to simulate reaction force analysis and fatigue analysis of new developed modules. Also, real simulator tests to validate performance of new developed modules are performed. We had developed the accelerated durability test procedure of KATECH PG and it is used to test chassis corner modules at laboratory and simulate durability performance. All these results have been provided to module and parts company and make an important role to develop chassis corner modules.
Analysis of Transient Maneuvers for Objectifying Evaluation of Vehicle Stability
Kim, Jung-Sik ; Kim, Young-Tae ; Yoon, Yong-San ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 167~175
Directional stability is important performance in vehicle and tire design. The current methods to analyze this is generally based on linear concept. Using the existing concept, it cannot realistically explain the subjective assessment at all because it is hard to practically represent the nonlinear behaviour of a complex vehicle system in reality. In this paper, new method to analyze directional stability is introduced. At first, directional stability of vehicle is categorized into yaw, rear axle, and roll stability. In order to objectify these items, driver perceptual parameters based on subjective assessment are used. Using the perceptual parameters, it can successfully explain the transient maneuver of vehicle and extract objective parameters for directional stability. Finally, these objective parameters are successfully validated through two handling tests, lane change and severe lane change. The correlation results show that there exists a good correlation between subjective assessment and the proposed objective parameters.
Analysis of Electro-magnetic Waves for the
Bands in a Cabin of Automobile
Choe Gwangje ; Jho Shigie ; Jeung Weolrark ; Jang Sungkuk ; Kang Shinhan ; Han Sangwhi ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 176~182
In this paper, we have measured the power of the electro-magnetic waves in the cabin of automobiles with automatic transmission or manual transmission. Measured frequency ranges are
. Experimental studies are conducted by measuring the radiated power of the frequency spectrum for above frequency bands. The
dipoles used for measurement are fabricated to comply with the COMMISSION DIRECTIVE 95/54/EC. Experimental results confirm that the level of radiated power in the cabin of automobile with automatic transmission is higher than that with manual transmission. The measured values are less than -85dBm for the manual transmission vehicles, but more than -79dBm for the automatic transmission vehicles.
A Study on the PM Oxidation Characteristics of Electrical Heater DPF System
Ham, Yun-Young ; Kim, Dae-Ha ; Kim, Kyung-Woon ;
Transactions of the Korean Society of Automotive Engineers, volume 14, issue 1, 2006, Pages 183~190
For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature
with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.